Citation needed, particularly for Nature. As far as I can tell the supposed disparities are explained by the amount of violent crime the race and ethnicity commits (leading to more police interactions), but it's impolite to bring that up.
If the rare skeptic persists at this point you can now label them a "white supremacist," having conveniently shifted the goalposts on that term so that they are now an irredeemable racist, and proceed to burn their existence to the ground and salt the earth.